Valve-gear for ore-stamps



(No Model.)

0. KENDRIOK, Jr. VALVE GEAR FOR ORE STAMPS No. 451,765. Patented May 5,1891.

mmmlmuumlmummmm) UNTTED STATES PATENT OFFICE.

COLIN KENDRICK, JR., OF NEVADA CITY, CALIFORNIA.

VALVE-GEAR FOR ORE-STAM PS.

SPECIFICATION forming part of Letters Patent N0. 451,765, dated May 5, 1891.

Application filed J annary 23, 1891. Serial No. 378,789- (No model.)

To all whom, it ntwy concern:

Be it known that I, COLIN KENDRIOK, Jr., of Nevada City, in the county of Nevada and State of California, have invented certain new and useful Improvements in Valve-Gears for Ore-Stamps; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification, in which Figure 1 is a perspective view of my improved valve-gear for twin-cylinder engines. Fig. 2 is a plan view. Fig.3 is a detail view.

This invention is animprovement in valveoperating gear for twin-cylinder engines; and its object is to make one engine assist in operating the valves of the other and to so connect the valve-rods of the two engines that they will be operated simultaneously but oppositely, and to enable the time of operation of the valves to be regulated, so that the steam, &c., can be cut off at various points in the stroke of the piston, so that the strokes of the pistons may be cushioned more or less, and, further, to operate the valves suddenly and quickly, instead of gradually, all of which will be accomplished by the means hereinafter clearly set forth and claimed.

Referring to the drawings by letters, K K designate twin cylinders of ordinary construction; I I, the piston-rods, which, as indicated, project through both ends of the cylinder, (the drawings representing cylinders of a vertical engine or stamp-mill,) and J J are slide-valve chests, and H H the valve-rods. The valves are of any suitable construction.

j designates a bracket-casting attached to the chests and having its central portion rising above the tops of the chests, and G is a verti cally oscillating bar centrally pivoted on bracket j, as indicated. The ends of barGare connected to pieces M M, pivotally connected by one end to the upper ends of rods H, preferably in such manner that the pieces may have a horizontal but no vertical play in relation to the ends of the bar. The upper ends of pieces M are connected by a universal joint D with the lower ends of straps L L, the upper ends of which are pivotally connected to levers A A about centrally thereof, and these levers are in turn each pivoted at one end to the end of an arm 0, attached to the valvechest or other suitable support. LeversA A thus overlie the valve-chests and cylinders, as indicated, and in the free end of each lever is an adjustable impact-bolt F, which will be struck by the projecting end of the piston-rod when the levers are lowered.

Owing to the connections between bar G, valve-rods H, and lever A A, when one lever and valve-rod are depressed the other lever and valve-rod are elevated, so when steam is admitted into the lower end of one cylinder it will be admitted into the upper end of the other, and vice versa. In operation steam is admitted into the cylinders so as to move the pistons in opposite directions. The ascending piston-rod as it nears the end of its stroke suddenly strikes the bolt F of the overreaching lever A and moves the same upward. This movement of the lever, through its connection, lifts its connected valve-rod H and adjoining end of bar G, while the opposite end of the bar, being thereby depressed, causes the opposite valve-rod and its connected lever to move downward. The levers A are thus operated alternately by the piston-rods as they ascend during the operation of the machine. As the levers A are not moved until the piston-rods are near the ends of theirstroke, the valves are shifted quickly and suddenly, and by adjusting impact-bolts F the amount of oscillation of levers A and the moment of impact of the pitman-rods can be varied,as is evident. The invention can be worked with ordinary engines, wherein the piston-rods do not extend through both ends of the cylinder, simply by attaching striking-blocks to the rods, as is obvious, the levers A standing in front of the cylinders instead of in rear thereof.

Having described my invention, what I claim as new, and desire to secure by Letters Patent thereon, is

1. The combination of the cylinders, the piston-rods, valve-chests and valve-rods, and the oscillating bar-connected to said valverods, with the opposite levers pivoted to fixed supports at one end and adapted to be struck and shifted by the pitman-rods alternately, and the connections between said levers and valve-rods, substantially as and for the purpose described.

2. The combination of the cylinders, valvechests, piston and valve rods, an oscillating bar connected at its ends to the valve-rods, the levers pivoted at one end to fixed supports, the link connections between said levers and valve-rods, and the impact-bolts in the free ends thereof adapted to be contacted by the piston-rods, substantially as set forth.

3. The combination of the cylinders, valvechests, piston and valve rods, the levers pivoted at one end to suitable supports, the the straps connecting said levers to the valverods, and the adjustable in1pact-pieces on the 

